Popping out exhaust, loss of power, wont run at full throttle.

Have replaced plugs,cleaned carb, replaced key, cleaned gas filter,replaced fuel, put in new valves,lifters and push rods. Checked for cracked heads, changed the oil. It has plenty of fire and compression.The valves seem to be open and closing correctly.I have not taken a hammer to it yet ! Almost to the point . The 20 hp kohler was running perfect and when I idled the throttle down and turned off the key it popped one time and when I started it up minutes later this is the problem it started giving me ?

2 Answers

I had the same problem. If it is a 2 cylinder, remove the valve covers. On one side, the rocker arm had slipped off of the push rod. It was real loose. Put the rocker arm back on the push rod and tighten it down. I think this will do the trick.

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didnt specify the make and model so generic answer ---check fuel mixture is correct --check the filter in tank is not plugging up--look for damaged / crack in fuel feed lines-look at spark plug --carb may need cleaning --exhaust port may need cleaning

You might try changing the fuel line itself. Do this especially if anyone has recently changed them. Though heard of less these days than in the past, some fuel lines will separate and actually close up somewhat once it gets warm. This is usually accompanied with a significant bit of backfiring and popping.

it sounds like your carb is gummed up. You can TRY something called SEA FOAM (you can get it from Napa), you put it in your gas tank. It's the poor man's tune-up. Otherwise, you can get some spray carb cleaner and pull off your air cleaner and spray it in there. Hope that helps.

Pumping the primer bubble while the engine is running should cause the engine to over fuel and stall (if the tuning is correct). Sounds like its not fueling enough, pumping the primer is forcing fuel through the carb causing the engine to pick up rev's, but this is soon exhausted which is why it wont rev on the throttle.* Check that the fuel line is not damaged and drawing in air. (if this is intact try the next step)* Strip and clean the carb. Replace any diaphrams if needed.* Check gaskets seal between carb, air filter and cylinder.

Since you don't indicate the make and model, I can't give you specifics, but when I had this problem it turned out to be a dirty carb. This can cause uneven fuel flow and loss of power. At full throttle, you may not be getting sufficient fuel to work properly. Try cleaning the carb a nd update this with the results.